| Singles | |
|---|---|
| 2024 Upper Austria Open | |
| Champion |  Lucas Pouille |
| Runner-up |  Jozef Kovalík |
| Score | 6–3, 6–3 |
Hamad Medjedovic was the defending champion [1] but chose not to defend his title.
Lucas Pouille won the title after defeating Jozef Kovalík 6–3, 6–3 in the final.
Francisco Comesaña (semifinals, retired) Román Andrés Burruchaga (second round)
Gabriel Diallo (first round, retired)
Otto Virtanen (second round)
Benjamin Hassan (first round, retired) Jozef Kovalík (final) Ugo Blanchet (second round)
Sho Shimabukuro (first round, retired)| Semifinals | Final | ||||||||||||
| 1 | Francisco Comesaña | 65 | 1r | ||||||||||
| Lucas Pouille | 77 | 3 | |||||||||||
| Lucas Pouille | 6 | 6 | |||||||||||
| 6 | Jozef Kovalík | 3 | 3 | ||||||||||
| Alt |  Dimitar Kuzmanov | 712 | 3 | 0 | |||||||||
| 6 | Jozef Kovalík | 610 | 6 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | F Comesaña | 6 | 6 | ||||||||||||||||||||||||
 J De Loore | 3 | 3 | 1 | F Comesaña | 6 | 6 | |||||||||||||||||||||
| WC |  Sandro Kopp | 2 | 3 | JM Cerúndolo | 1 | 2 | |||||||||||||||||||||
| JM Cerúndolo | 6 | 6 | 1 | F Comesaña | 7 | 6 | |||||||||||||||||||||
| F Misolic | 6 | 3 | 6 | F Misolic | 5 | 4 | |||||||||||||||||||||
 M-A Hüsler | 2 | 6 | 4 | F Misolic | 3 | 6 | 6 | ||||||||||||||||||||
| M Martineau | 3 | 6 | 2 | 7 | U Blanchet | 6 | 3 | 2 | |||||||||||||||||||
| 7 | U Blanchet | 6 | 4 | 6 | 1 | F Comesaña | 65 | 1r | |||||||||||||||||||
| 4 | O Virtanen | 6 | 7 | L Pouille | 77 | 3 | |||||||||||||||||||||
| LL | S Fanselow | 2 | 5 | 4 | O Virtanen | 77 | 65 | 5 | |||||||||||||||||||
| WC | Sebastian Sorger | 1 | 2 | Q | MH Rehberg | 64 | 77 | 7 | |||||||||||||||||||
| Q | MH Rehberg | 6 | 6 | Q | MH Rehberg | 2 | 3 | ||||||||||||||||||||
| L Pouille | 6 | 3 | 6 | L Pouille | 6 | 6 | |||||||||||||||||||||
| D Novak | 3 | 6 | 4 | L Pouille | 77 | 6 | |||||||||||||||||||||
 J Choinski | 6 | 2 | J Choinski | 63 | 3 | ||||||||||||||||||||||
| 5 | B Hassan | 2 | 0r | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | S Shimabukuro | 7 | 1 | 1r | |||||||||||||||||||||||
 M Landaluce | 5 | 6 | 2 | M Landaluce | 4 | 2 | |||||||||||||||||||||
| Q | M Rosenkranz | 61 | 4 | WC | J Schwärzler | 6 | 6 | ||||||||||||||||||||
| WC | J Schwärzler | 77 | 6 | WC | J Schwärzler | 2 | 3 | ||||||||||||||||||||
| Alt | D Kuzmanov | 6 | 6 | Alt | D Kuzmanov | 6 | 6 | ||||||||||||||||||||
| Q |  M Safwat | 3 | 2 | Alt | D Kuzmanov | 2 | 6 | 6 | |||||||||||||||||||
| L Neumayer | 4 | 7 | 4 | L Neumayer | 6 | 2 | 0 | ||||||||||||||||||||
| 3 | G Diallo | 6 | 5 | 2r | Alt | D Kuzmanov | 712 | 3 | 0 | ||||||||||||||||||
| 6 | J Kovalík | 6 | 77 | 6 | J Kovalík | 610 | 6 | 6 | |||||||||||||||||||
 V Gaubas | 0 | 60 | 6 | J Kovalík | 6 | 6 | |||||||||||||||||||||
 G Heide | 6 | 1 | 6 | G Heide | 2 | 1 | |||||||||||||||||||||
| Q | Arthur Gea | 3 | 6 | 3 | 6 | J Kovalík | 78 | 6 | |||||||||||||||||||
| Q | J Kym | 2 | 6 | 3 | Q | G Melzer | 66 | 3 | |||||||||||||||||||
| Q | G Melzer | 6 | 3 | 6 | Q | G Melzer | 6 | 6 | |||||||||||||||||||
 E Ymer | 6 | 3 | 4 | 2 | RA Burruchaga | 4 | 4 | ||||||||||||||||||||
| 2 | RA Burruchaga | 3 | 6 | 6 | |||||||||||||||||||||||
Víctor Estrella Burgos was the defending champion and successfully defended his title, defeating Thomaz Bellucci in the final, 4–6, 7–6(7–5), 6–2.
Andy Murray was the defending champion, but chose not to participate this year.
Taro Daniel was the defending champion but failed to defend his title, losing to Thiago Monteiro in the second round.
Tomáš Berdych was the defending champion and successfully defended his title, defeating Richard Gasquet in the final, 7−6(7−5), 6−7(2−7), 6−3.
Malek Jaziri was the defending champion but chose not to defend his title.
Pablo Cuevas was the two-time defending champion and successfully defended his title, defeating Albert Ramos Viñolas in the final, 6–7(3–7), 6–4, 6–4.
Philipp Kohlschreiber was the defending champion, but lost in the second round to Horacio Zeballos.
Grigor Dimitrov was the defending champion, but withdrew before the tournament because of a shoulder injury.
Alexander Zverev was the defending champion and successfully defended his title, defeating Philipp Kohlschreiber in the final, 6–3, 6–3.
Cedrik-Marcel Stebe was the defending champion but chose not to defend his title.
Nicola Kuhn was the defending champion but lost in the first round to Yannick Hanfmann.
Leonardo Mayer was the defending champion, but lost in the final to Nikoloz Basilashvili, 4–6, 6–0, 5–7. This was Basilashvili's first ATP World Tour title, as well as the first ATP title won by a Georgian player since Alexander Metreveli.
Casper Ruud became the first Norwegian to win an ATP title, defeating Pedro Sousa in the final, 6–1, 6–4.
Jozef Kovalík was the defending champion but lost in the quarterfinals to Carlos Taberner.
Lorenzo Sonego defeated defending champion Laslo Đere in the final, 2–6, 7–6(7–5), 6–4 to win the men's singles title at the 2021 Sardegna Open. With the victory, Sonego became the first Italian in 15 years to capture an ATP Tour title on home soil.
Miomir Kecmanović was the defending champion, but chose to compete at the Summer Olympics instead.
Jozef Kovalík was the defending champion but chose not to defend his title.
Jozef Kovalík was the defending champion but chose not to defend his title.
Tommy Paul defeated the defending champion, Denis Shapovalov, in the final, 6–4, 2–6, 6–4, to win the singles title at the 2021 Stockholm Open. This was Paul's first ATP Tour title.
Roberto Bautista Agut defeated the defending champion Nikoloz Basilashvili in a rematch of the previous year's final, 6–3, 6–4 to win the singles title at the 2022 Qatar Open.